Poland: Recommended Reading For further study about Poland, Martin Gray recommends the following books and travel guides: Pilgrimage to Images in theFifteenth Century: The Origins of theCult of Our Lady of Czestochowa The Age of Pilgrimage:The Medieval Journey to God The Cult of the Black Virgin Catholic Shrines of WesternEurope: A Pilgrim's Travel Guide Glories of Czestochowaand Jasna Gora The Shrine of the BlackMadonna At Czestochowa Mail